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Income Taxes - Additional Information (Detail) - USD ($) |  | 9 Months Ended
--- | --- | ---
Apr. 01, 2020 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Examination [Line Items] |  |  |
Gross liability for tax positions |  | $ 117,000 |
Tax positions that will be resolved within the next twelve months |  | $ 54,000 |
Income tax examination years description |  | The Company is no longer subject to U.S. Federal income tax examinations for the years prior to 2014. |
State Jurisdiction | Minimum |  |  |
Income Tax Examination [Line Items] |  |  |
Income tax examination year |  | 2013 |
State Jurisdiction | Maximum |  |  |
Income Tax Examination [Line Items] |  |  |
Income tax examination year |  | 2016 |
Domestic |  |  |
Income Tax Examination [Line Items] |  |  |
Effective income tax rate |  | 78.90% | 14.90%
Foreign | UNITED KINGDOM |  |  |
Income Tax Examination [Line Items] |  |  |
Effective income tax rate, change in enacted rate |  | 18.00% |
Foreign | Scenario, Forecast | UNITED KINGDOM |  |  |
Income Tax Examination [Line Items] |  |  |
Effective income tax rate, change in enacted rate | 17.00% |  |

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